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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a2b8a7c8790bb025b4edaa18bd2b1fda4c8401916e6d7a8e70ea27353cb215' 
  AND token = 'SxC1xMGHjtsAEk47ZcxfuNnsdTJj72JMNA9jxACjUBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}